food chainA food chain is is the sequence of who eats whom in a biological community (an ecosystem) to obtain nutrition. A food web is all of the interactions between predators and prey in which plants and animals obtain food in an ecoystem.

food pyramidThe food pyramid is a diagram that lets you know the US government's recommended diet.

phases of the MoonAs the moon circles the Earth, the shape of the Moon appears to change. The phases of the Moon are: the new moon, waxing crescent, first quarter, waxing gibbous, full moon, waning gibbous, last quarter, and waning crescent.